abell



No. 6l9,l|0. Patented Feb. 7, I899. J. ABELL.

GUT-DEF FOR PORTABLE OR OTHER ENGINES.

(Application filed May 11, 1898.)

(No Model.) 2 Sheets-Sheet I.

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No. 6|9,H0. Patented Feb. 7, I899, J. ABELL. CUT-OFF FOB PORTABLE OR OTHER ENGINES.

2 Sheets-Sheet 2.

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' (Application filed ma 11, 1898.)

(No Model.)

I' I" G L j I" I UNITED STATES PATENT OFFICE.

JOHN ABELL, OF TORONTO, CANADA.

CUT-OFF FOR PORTABLE OR OTHER ENGINES.

SPECIFICATION forming part of Letters Patent No. 619,110, dated February 7, 1899.

Application filed May 11, 1898.

To all whom, it vnay concern:

Be it known that I, JOHN ABELL, man ufacturerfof the city of Toronto, in the county of York and Province of Ontario, Canada, have invented a new and Improved Reverse and Variable Cut-Off for Portable or other Engines,of which the followingis a specification.

The object of my invention is to devise a reverse and. variable cut-off which will permit of the widest possible range and accuracy of cut-off, which will reverse quickly, and which is simple in construction and reliable in operation; and it consists, essentially, in operating the valve-connecting rod from a crank-pin on a slide adjustable on a suitablydriven crank-disk and provided with means whereby its position on the disk may be changed at will while the parts are in motion, substantially as hereinafter more specifically described and then definitely claimed.

Figure 1 is a plan view of a portable engine provided with my. improvements. Fig. 2 is an enlarged sectional elevation of the reverse and cut-off. Fig. 3 is a perspective view of the movable sleeve. Fig. 4 is an end view of the slide and the disk on which it is mov- G is formed upon the inner surface of the slide. The disk F is carried by a sleeve H, suitably journaled on the top of the engine. A gear-wheel I is also formed on or connected to the disk F and meshes with a gear-wheel J upon the main shaft K of the engine.

Extending through the sleeve'I-I is the shaft L, having upon the one end a pinion M, meshing with the rack G. Its other end extends Serial No. 680,391. (No model.)

out beyond the sleeve II and has a sleeve N secured thereon, which sleeve is suitably journaled, as indicated. The sleeve and shaft are preferably connected by means of a setscrew a, so that their position in regard to one another can be altered.

Surrounding the sleeves H and N is a longitudinally-movable sleeve 0, provided with a collar b. Surrounding this collar is ababbitt-lined shifter P, pivotally connected with one arm of the bell-crank lever Q, suitably pivoted on-the frame of the machine. The other arm of this bell-crank lever is connected bya suitable rod cwith the hand-lever R, by means of which the bell-crank lever may be moved as required to shift the sleeve 0 and to hold it as moved.

Cut in the sleeve N are the oppositely-inclined slots d, with which engage blocks, preferably pivotally connected to the sleeves H and N.

From the construction described it follows that by shifting the sleeve 0 a rapid movement of rotation will be given to the shaft L relative to the sleeve H, and that consequently the position of the slide E upon the face of the disk F will be altered. As such a shifting of the slide moves its wrist-pin with respect to the center of the disk,it is evident that the travel of the valve-connecting rod will be altered, and consequently the cut-0E of the valve. The cut-off maybe thus varied to admit live steam for the full length of the stroke or to permit of expansion, as may be desired, up to six-tenths of the stroke. As by moving the slide the position of the wrist-pin may be instantly reversed, it is evident that the engine will be also reversed, so that the operation of the engine is entirely under control by the operator at the hand-lever R.

I do not wish to confine myself to the exact construction shown, as the disk F might be diiferently driven and different arrangements provided for shifting the relative position of the sleeve H and the shaft L whilethe engine is in motion.

It will be seen that I have devised a very simple and effective reverse and variable cutoif, which gives to the engineer the greatest possible control over the engine and enables him to secure the maximum amount of work from the engine in proportion to the fuel and water used.

What I claim as my invention is 1. In mechanism for the purpose described a slide having a wrist-pin on one side of the center thereof on which is j ournaled 'the valveconnecting rod in combination with a disk having guides thereon in which the said slide may move; a suitably-journaled sleeve on which the said disk is fast; means for revolving the said sleeve from some moving part; a shaft within the sleeve; a connection between the shaft and the slide whereby the latter may be moved by the turning of the shaft; and means for turning the said shaft, substantially as and for the purpose specified. 2. In mechanism for the purpose described a slide having a wrist-pin on one side of the center thereof on which is j ournaled the valveconnecting rod in combination with a disk having guides thereon in which the said slide may move; a suitably -journaled sleeve on which the said disk is fast; means for revolving the said sleeve from some moving part; a shaft within the sleeve; a pinion on the shaft; a rack on the slide with which the said pinion engages; and means for turning the shaft, substantially as and'for the purpose specified. 3. In mechanism for the purpose described a slide having a wrist-pin on one side of the center thereof on which is j ournaled the valveconnecting rod in combination with a disk having guides thereon in which the said slide may move; a suitably-journaled sleeve on which the said disk is fast; means for revolving the said sleeve from some moving part; a shaft within the sleeve; a connection between the shaft and the slide whereby the latter may be moved by the turning of the shaft; a sleeve secured on the shaft at the end of the first-mentioned sleeve; a block projecting from each sleeve; a longitudinally-movable sleeve embracing the said sleeves and provided with oppositely-inclined slots engaging the said blocks, substantially as and for the purpose specified.

4. In mechanism for the purpose described a slide having a wrist-pin thereon on which is journaled the valve-connecting rod in combination with a disk having guides thereon in which the said slide may move; a suitablyjournaled sleeve on which the said disk is fast; means for revolving the said sleeve from some moving part; a shaft within the sleeve; a connection between the shaft and the slide whereby the latter may be moved by the turning of the shaft; a sleeve adjustably secured on the shaft at the end of the first-mentioned sleeve; a block projecting from each sleeve; a longitudinally-movable sleeve embracing the said sleeves and provided with oppositelyinclined slots engaging the saidblocks, substantially as and for the purpose specified.

5. In mechanism for the purpose described a slide having a wrist-pin thereon on which is journaled the valve-connecting rod incombination with a disk having guides thereon in which the said slide may move; a suitablyjournaled sleeve on which the said disk is fast means for revolving the said sleeve from some moving part; a shaft within the sleeve; a connection between the shaft and the slide whereby the latter may be moved by the turn= ing of the shaft; a sleeve secured on the shaft at the end of the first-mentioned sleeve; a block projecting from each sleeve; a longitudinally-movable sleeve embracing the said sleeves and provided with oppositely-inclined slots engaging the said blocks; a collar formed on the said sleeve; a bell-crank lever adapted to engage the said collar and means for moving the said lever and holding it as moved, substantially as and for the purpose specified.

6. In mechanism for the purpose described a slide having a wrist-pin thereon on which is journaled the valve-con'nectin g rod in combination with a disk having guides thereon in which the said slide may move; a suitablyjournaled sleeve on which the said disk is fast; means for revolving the said sleeve from some moving part; a shaft within the sleeve; a pinion on the shaft; a rack on the slide with which the said pinion engages; means for turning the shaft; a connection between the shaft and the slide whereby the latter may be moved by the turning of the shaft; a sleeve secured on the shaft at the end of the firstmentioned sleeve; a block projecting from each sleeve; a longitudinally-movable sleeve embracing the said sleeves and provided with oppositely-inclined slots engaging the said blocks, substantially as and for the purpose specified.

7. In mechanism for the purpose described the combination of a slide having a wrist-pin thereon on which is journaled the valve-connecting rod; a disk having guides thereon in which the said slide may move; a suitablyjournaled sleeve on which the said disk is fast; gearing between the said sleeve and the main shaft of the engine; a shaft within the sleeve; a connection between the shaft and the slide whereby the latter may be moved by the turning of the shaft, a sleeve secured on the shaft at the end of the first-mentioned sleeve; a block projecting from each sleeve; a longitudinally-movable sleeve embracing the said sleeves and provided with oppositelyinclined-slots engaging the said blocks; and means for adjusting the said sleeve while the engine is in motion, substantially as and for the purpose specified.

Toronto, April 15, 1898.

JOHN ABELL. In presence of O. J. AGAR,

E. H. HOLLAND. 

